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118 lines
3.9 KiB
C++
118 lines
3.9 KiB
C++
#include <Functions/IFunction.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/GatherUtils/GatherUtils.h>
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#include <DataTypes/DataTypeArray.h>
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#include <DataTypes/getLeastSupertype.h>
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#include <Interpreters/castColumn.h>
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#include <Columns/ColumnArray.h>
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#include <Columns/ColumnConst.h>
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#include <Common/typeid_cast.h>
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#include <ext/range.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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}
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/// arrayConcat(arr1, ...) - concatenate arrays.
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class FunctionArrayConcat : public IFunction
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{
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public:
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static constexpr auto name = "arrayConcat";
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static FunctionPtr create(const Context & context) { return std::make_shared<FunctionArrayConcat>(context); }
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FunctionArrayConcat(const Context & context) : context(context) {}
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String getName() const override { return name; }
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bool isVariadic() const override { return true; }
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size_t getNumberOfArguments() const override { return 0; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (arguments.empty())
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throw Exception{"Function " + getName() + " requires at least one argument.", ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH};
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for (auto i : ext::range(0, arguments.size()))
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{
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auto array_type = typeid_cast<const DataTypeArray *>(arguments[i].get());
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if (!array_type)
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throw Exception("Argument " + std::to_string(i) + " for function " + getName() + " must be an array but it has type "
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+ arguments[i]->getName() + ".", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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return getLeastSupertype(arguments);
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
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{
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const DataTypePtr & return_type = block.getByPosition(result).type;
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if (return_type->onlyNull())
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{
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block.getByPosition(result).column = return_type->createColumnConstWithDefaultValue(input_rows_count);
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return;
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}
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auto result_column = return_type->createColumn();
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size_t rows = input_rows_count;
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size_t num_args = arguments.size();
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Columns preprocessed_columns(num_args);
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for (size_t i = 0; i < num_args; ++i)
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{
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const ColumnWithTypeAndName & arg = block.getByPosition(arguments[i]);
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ColumnPtr preprocessed_column = arg.column;
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if (!arg.type->equals(*return_type))
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preprocessed_column = castColumn(arg, return_type, context);
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preprocessed_columns[i] = std::move(preprocessed_column);
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}
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std::vector<std::unique_ptr<GatherUtils::IArraySource>> sources;
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for (auto & argument_column : preprocessed_columns)
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{
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bool is_const = false;
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if (auto argument_column_const = typeid_cast<const ColumnConst *>(argument_column.get()))
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{
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is_const = true;
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argument_column = argument_column_const->getDataColumnPtr();
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}
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if (auto argument_column_array = typeid_cast<const ColumnArray *>(argument_column.get()))
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sources.emplace_back(GatherUtils::createArraySource(*argument_column_array, is_const, rows));
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else
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throw Exception{"Arguments for function " + getName() + " must be arrays.", ErrorCodes::LOGICAL_ERROR};
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}
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auto sink = GatherUtils::createArraySink(typeid_cast<ColumnArray &>(*result_column), rows);
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GatherUtils::concat(sources, *sink);
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block.getByPosition(result).column = std::move(result_column);
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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private:
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const Context & context;
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};
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void registerFunctionArrayConcat(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionArrayConcat>();
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}
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}
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